Rosenbrock's function

Rosenbrock's function is is unimodal. and definded as:

rosenb_2.png (827 bytes)

rosenb_1.png (5605 bytes)

Its minimum 0 at (1,1) is not easy to find because it is situated in a valley with a flat bottom.

Rastrigin's function is from http://www.robotic.dlr.de/Holger.Weiss/garep/node4.html